Question

evaluate sin25cos65 + cos25sin65​

Answer 1

Sin25°Cos65° + Cos25°Sin65°

= Sin (90-65)°Cos65° + Cos(90-65)°Sin65°

= Cos65°Cos65° + Sin65°Sin65°

$= {cos}^{2} 65 + {sin}^{2} 65$

= 1

Because we know that;

${cos}^{2}a + {sin}^{2}a = 1$

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